Isolation double grounding switch

Abstract

The utility model relates to the technical field of high-voltage or large-current switches with arc extinguishing or arc preventing functions, in particular to an isolating double-grounding switch. The isolation double-grounding switch comprises a tank body, two ends of the tank body are respectively provided with a wire inlet seat and a wire outlet seat, the circumferential surface of the tank body is respectively provided with a load grounding moving contact and a circuit breaker grounding static contact, and the load grounding moving contact and the circuit breaker grounding static contact are arranged at the same side of the radial direction of the tank body. A moving contact seat is arranged on the wire inlet seat in the tank body, an isolation static contact is arranged on the wire outlet seat, an isolation moving contact is installed on the moving contact seat corresponding to the isolation static contact, and a circuit breaker grounding moving contact is installed on the moving contact seat corresponding to the circuit breaker grounding static contact. The load grounding static contact and the load grounding moving contact are correspondingly installed and arranged on the isolation static contact, and the load grounding moving contact and the circuit breaker grounding moving contact are installed on the same side so as to meet the requirements of field installation and wiring.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage or high-current switch technology with arc extinguishing or arc prevention, and in particular to an isolating double grounding switch. Background Technology

[0002] With the development of overseas markets and the renovation and expansion of old power transmission and substations in China, the demand for combined electrical switchgear is increasing. At the same time, higher requirements are being placed on the safe and reliable operation and maintenance of the power grid. Isolating double grounding switches are an important component of combined electrical switchgear.

[0003] Chinese utility model patent with authorization announcement number CN202142460U and authorization announcement date of February 8, 2012, discloses a double-grounded direct-through type three-position isolating grounding switch. This isolating grounding switch includes an electric spring operating mechanism connected to a drive shaft. A fast grounding switch is located at the end of the drive shaft away from the electric spring operating mechanism. The fast grounding switch includes a fast circuit breaker grounding stationary contact and a fast circuit breaker grounding moving contact. The fast grounding function is achieved through the spring operating mechanism. A moving contact seat is fixedly connected to the housing, and a rotating moving contact is located on the moving contact seat. The same rotating moving contact achieves the linkage of grounding and isolation functions. The housing also houses an isolation stationary contact and a circuit breaker grounding stationary contact corresponding to the rotating moving contact, realizing an integrated design of a double-grounding isolation switch. The two ends of the double-grounding isolation switch are respectively equipped with an inlet socket for connection to the circuit breaker and an outlet socket for connection to the load. The fast grounding switch is connected to the inlet socket to ground the circuit breaker, and the isolation grounding switch is connected to the outlet socket to ground the load. The structure of this double-grounding isolation switch has grounding terminals distributed on opposite sides, which cannot meet the needs of field use when grounding on the same side is required. Utility Model Content

[0004] The purpose of this utility model is to provide an isolating double grounding switch to meet the usage requirements of on-site isolating double grounding switches with grounding on the same side.

[0005] The technical solution of this utility model's isolation double grounding switch is as follows:

[0006] A double-grounding isolating switch includes a tank body with an inlet and an outlet terminal block at each end. A load grounding moving contact and a circuit breaker grounding stationary contact are respectively arranged on the circumferential surface of the tank body, located on the same radial side of the tank body. Inside the tank body, a moving contact seat is provided on the inlet terminal block, and an isolating stationary contact is provided on the outlet terminal block. An isolating moving contact is installed on the moving contact seat corresponding to the isolating stationary contact, and a circuit breaker grounding moving contact is installed on the moving contact seat corresponding to the circuit breaker grounding stationary contact. A turntable is provided on the moving contact seat, and a linkage rod rotatably connected to the turntable and connected to the isolating moving contact and the circuit breaker grounding moving contact, respectively. The load grounding stationary contact and the load grounding moving contact are correspondingly installed on the isolating stationary contact.

[0007] Furthermore, a guide section is provided on the moving contact seat, and the isolating moving contact and the circuit breaker grounding moving contact are slidably installed in the corresponding guide section. A spring contact finger is provided between the guide section and the isolating moving contact and the circuit breaker grounding stationary contact.

[0008] Furthermore, the inlet seat is provided with a flange face, and the inlet seat is connected to the tank body through a flange. The connection part between the tank body and the inlet seat has an opening for disassembling and assembling the moving contact seat.

[0009] Furthermore, the outlet socket is provided with a flange face, and the outlet socket is connected to the tank body through a flange. The connection part between the tank body and the outlet socket has an opening for isolating the disassembly and assembly of the stationary contact.

[0010] Furthermore, the circuit breaker grounding stationary contact is detachably installed on the tank body. One end of the circuit breaker grounding stationary contact is fixedly connected to a fixing block. The outer wall of the fixing block is provided with a flange surface for fixed connection with the tank body. The end of the fixing block away from the circuit breaker grounding stationary contact is fixedly connected to a conductive strip, which is fixedly connected to the tank body.

[0011] Furthermore, the load grounding moving contact is installed in the load grounding crank arm box, which is connected to the tank body via a flange. The load grounding crank arm box includes a crank arm that is anti-rotationally engaged with the load grounding drive shaft, and the end of the crank arm away from the load grounding drive shaft is connected to the load grounding moving contact in a driving connection.

[0012] Furthermore, an elongated hole perpendicular to the direction of movement of the load moving contact is provided at the position where the load grounding moving contact is connected to the crank arm, in order to balance the positional change caused by the conversion of the crank arm's rotational motion into linear motion.

[0013] Furthermore, the turntable anti-rotation connection has an insulated torsion bar for fixed connection with the drive shaft.

[0014] Furthermore, an isolation arc contact is provided at the end of the isolating stationary contact that is close to the isolating moving contact.

[0015] Furthermore, a molecular sieve is installed on the tank of the isolation double grounding switch.

[0016] Beneficial Effects: This utility model of a double-grounding isolating switch is an improved invention. The double-grounding isolating switch includes a tank body, with an inlet socket and an outlet socket at each end. The inlet socket is used to connect to a circuit breaker, and the outlet socket is used to connect to a load. A load grounding moving contact is provided on one side of the circumferential surface of the tank body. A circuit breaker grounding stationary contact is provided on the circumferential surface of the load grounding moving contact along the axial direction of the tank body. A moving contact seat and an isolating stationary contact are provided inside the tank body between the inlet socket and the outlet socket. An isolating moving contact is installed on the moving contact seat corresponding to the isolating stationary contact, and a circuit breaker grounding contact is installed on the moving contact seat corresponding to the circuit breaker grounding stationary contact. The moving contact has a rotating disk on its seat. The rotating disk is rotatably connected to a linkage rod that connects to both the isolating moving contact and the circuit breaker grounding moving contact. The isolating and grounding functions are linked via a common drive shaft. The moving contact seat has a guide section, forming a "linkage slider" structure. The isolating moving contact and the circuit breaker grounding moving contact are slidably installed in their respective guide sections. The load grounding stationary contact is installed correspondingly to the load grounding moving contact and is positioned on the isolating stationary contact. The load grounding moving contact and the circuit breaker grounding moving contact are installed on the same side to meet on-site installation and wiring requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one embodiment of the isolation double grounding switch of this utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of BB;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the moving contact seat;

[0020] Figure 4 for Figure 3 Schematic diagram of the structure of AA;

[0021] Figure 5 This is a schematic diagram of the load grounding crank box.

[0022] In the diagram: 1. Moving contact seat; 2. Turntable; 3. Linkage rod; 4. Isolating moving contact; 5. Circuit breaker grounding moving contact; 6. Rotating plate; 7. Spring contact finger; 8. Load grounding moving contact; 9. Crank arm; 10. Load grounding contact seat; 11. Grounding busbar; 12. Load grounding drive shaft; 13. Drive shaft; 14. Circuit breaker grounding stationary contact; 15. Isolating arc contact; 16. Isolating stationary contact; 17. Load grounding stationary contact; 18. Load grounding crank arm box; 19. Observation window; 20. Air inlet; 21. Rupture disc; 22. Molecular sieve; 23. Tank; 24. Bearing; 25. Insulating torsion bar; 26. Inlet socket; 27. Outlet socket; 28. Fixing block; 29. ​​Conductive strip. Detailed Implementation

[0023] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0024] When installing a double-grounding isolating switch in the field, the terminals must be installed on the same side, but existing switch structures cannot achieve this. The present invention aims to optimize the internal switch structure so that the two grounding terminals can be installed on the same side.

[0025] The specific implementation method of the isolation double grounding switch of this utility model is as follows:

[0026] Based on the above ideas, such as Figure 1 , 2 As shown in Figures 3 and 4, in a basic embodiment, the isolation double grounding switch of this utility model includes a tank body 23. An inlet socket 26 and an outlet socket 27 are respectively provided at both ends of the tank body 23. The inlet socket 26 is used to connect to a circuit breaker, and the outlet socket 27 is used to connect to a load. A load grounding moving contact 8 and a circuit breaker grounding stationary contact 14 are respectively provided on the circumferential surface of the tank body 23. The load grounding moving contact 8 and the circuit breaker grounding stationary contact 14 are located on the same radial side of the tank body. Inside the tank body 23, a moving contact seat 1 is provided on the inlet socket 26, and an isolation stationary contact 4 is provided on the outlet socket 27. The moving contact seat 1 is connected to the isolation stationary contact 16. A corresponding isolating moving contact 4 is installed. A circuit breaker grounding moving contact 5 is installed on the moving contact base 1, corresponding to the circuit breaker grounding stationary contact 14. A turntable 2 is provided on the moving contact base 1. A linkage rod 3, which is rotatably connected to the isolating moving contact 4 and the circuit breaker grounding moving contact 5 respectively, is mounted on the turntable 2. The linkage of the isolating grounding function is achieved by using the same drive shaft. The load grounding stationary contact 17 and the load grounding moving contact 8 are installed on the isolating stationary contact 16. The load grounding moving contact 8 and the circuit breaker grounding moving contact 14 are installed on the same side to meet the requirements of on-site installation and wiring.

[0027] In a preferred embodiment, the moving contact seat 1 is provided with a guide section. The isolating moving contact 4 and the circuit breaker grounding moving contact 5 are slidably installed in the corresponding guide section to realize the conversion between the rotational motion of the drive shaft 13 and the linear motion of the moving contact in the guide section. By adopting the form of a connecting rod and slider, the rotational motion of the drive shaft 13 is converted into the linear motion of the isolating moving contact 4 and the circuit breaker grounding moving contact 5, which reduces the footprint. A spring contact finger 7 is provided between the guide section and the isolating moving contact 4 and the circuit breaker grounding stationary contact 14. By providing the spring contact finger 7, good current flow can be achieved between the guide section and the isolating moving contact 4 and the circuit breaker grounding stationary contact 14, thereby ensuring the stability of the conductive connection and preventing the moving contact from being loosely connected during the opening and closing process, thus failing to achieve the designed function.

[0028] The turntable 2 consists of two identical rotating plates 6 and a connecting post for fixing the rotating plates 6. A linkage rod 3 is positioned between the two rotating plates 6. By limiting the linkage rod 3 through the two rotating plates 6, axial movement of the linkage rod 3 on the transmission shaft 13 can be prevented, thus avoiding interference with the normal contact and conductivity of the moving and stationary contacts and improving the reliability of the conductive connection. A bearing 24 is provided between the rotating plate 6 and the moving contact seat 1 to reduce friction between them, thereby reducing frictional heat and wear and preventing wear at the connection point that could lead to unstable rotation. In other embodiments, although omitting the bearing 24 may cause friction between the rotating plate 6 and the moving contact seat 1, normal operation is still possible.

[0029] In a preferred embodiment, the inlet connector 26 is provided with a flange face, and the inlet connector 26 is connected to the tank body 23 via a flange. An opening is provided at the connection between the tank body 23 and the inlet connector 26 for disassembling and assembling the moving contact 1. This design allows for modular installation of the inlet connector 26, enabling different functions to be implemented according to usage requirements. In other embodiments, it can also be fixedly connected by welding. Although it cannot be disassembled and adjusted, it can still function normally and provides better airtightness.

[0030] In a preferred embodiment, the outlet socket 27 is provided with a flange face, and the outlet socket 27 is connected to the tank body 23 via a flange. The connection portion between the tank body 23 and the outlet socket 27 has an opening for isolating the static contact 16 from disassembly and assembly. This design allows for modular installation of the outlet socket 27, enabling different functions to be implemented according to usage requirements. In other embodiments, it can also be fixedly connected by welding. Although it cannot be disassembled and adjusted, it can still function normally and provides better airtightness.

[0031] In a preferred embodiment, the circuit breaker grounding stationary contact 14 is detachably mounted on the tank body 23. One end of the circuit breaker grounding stationary contact 14 is fixedly connected to a fixing block 28. The outer wall of the fixing block 28 is provided with a flange surface for fixed connection with the tank body 23. The end of the fixing block 28 away from the circuit breaker grounding stationary contact 14 is fixedly connected to a conductive strip 29. The conductive strip 29 is fixedly connected to the tank body 23 to ensure a stable conductive connection between the circuit breaker grounding stationary contact 14 and the tank body 23, and to ensure that the grounding function of the circuit breaker grounding stationary contact 14 is properly realized.

[0032] like Figure 5As shown, in a preferred embodiment, the load grounding moving contact 8 is installed in the load grounding crank arm box 18, which is connected to the tank body 23 via a flange. The load grounding crank arm box 18 includes a crank arm 9 that engages with the load grounding drive shaft 12 to prevent rotation. The end of the crank arm 9 away from the load grounding drive shaft 12 is connected to the load grounding moving contact 8. A load grounding contact seat 10 is provided along the axial direction of the load grounding moving contact 8 for guidance. The crank arm 9 is in contact with the grounding bar 11. The linear moving contact structure can save vertical space and floor space, while also helping to ensure a good electrical connection when the switch is closed, reducing contact resistance and temperature rise, and improving the current carrying capacity and dynamic and thermal stability of the switch.

[0033] In other implementations, the load grounding moving contact 8 adopts a rotating moving contact design. Although this increases the space occupied and affects the reliability of the conductive connection between the moving and stationary contacts, it can still work normally.

[0034] In a preferred embodiment, an elongated hole perpendicular to the direction of movement of the load grounding moving contact 8 is provided at the connection position with the crank arm 9. This hole is used to balance the positional change caused by the conversion of the rotational motion of the crank arm 9 into linear motion, and to avoid adding a bending force perpendicular to the direction of movement of the load grounding moving contact 8, which would affect the normal operation of the load grounding moving contact 8. In other embodiments, the guide section is not provided; instead, a connecting rod and slider assembly is formed by adding rods. Although the structural complexity increases, it can still function normally.

[0035] In a preferred embodiment, the turntable 2 is connected to an insulated torsion bar 25 for fixed connection with the drive shaft 13. The main function of the insulated torsion bar 25 is to transmit torque, which can transmit the torque from the drive shaft 13 through the turntable 2 and the linkage rod to the moving contact, thereby realizing the closing or opening of the switch. The torsional characteristics of the insulated torsion bar 25 allow it to adjust the operating force to a certain extent while transmitting torque. At the moment the switch is closed or opened, the insulated torsion bar 25 can absorb and disperse the vibration and impact generated by the operation, making the operation of the switch more stable and reliable.

[0036] In other embodiments, the insulating torsion bar 25 is not provided, and the turntable 92 is driven directly through the transmission shaft 13. Although this will reduce the service life of the switch and affect the reliability and smoothness of the switch opening and closing, it can still work normally.

[0037] In a preferred embodiment, an arc-isolating contact 15 is provided at the end of the isolating stationary contact 16 near the isolating moving contact 4 to prevent the isolating stationary contact 16 from being burned and affecting the normal current flow of the power system. In other embodiments, similar effects can be achieved by providing other arc-initiating structures such as arc-initiating plates, and normal operation can be maintained.

[0038] In a preferred embodiment, the tank 23 of the isolating double-grounding switch is equipped with a molecular sieve 22, an observation window 19, and a rupture disc 21. The observation window 19 is used to visually display the connection status of the moving and stationary contacts. The molecular sieve 22 can absorb moisture and oxygen, preventing corrosion of the equipment, improving insulation performance, and reducing gas pressure and arc energy in the switch, thus helping to reduce heat and wear generated during operation. The rupture disc 21 is a fracture-type safety pressure relief device. When the pressure in the equipment, container, or system exceeds the limit for some reason, the rupture disc 21 is broken, releasing the excessive pressure to prevent damage to the equipment, container, or system. The tank 23 is also equipped with a gas filling port 20 for filling the inside of the isolating double-grounding switch with insulating gas.

[0039] During operation, the state control of the three switches is achieved through the transmission rod 13 and the rapid rotation shaft. By combining the states of the three switches, isolation grounding configurations such as double grounding, rapid grounding, and maintenance grounding can be achieved. When achieving rapid grounding, the rotation of the load grounding drive shaft 12 drives the crank arm 9 to rotate. When the end of the crank arm 9 moves downward along the elongated hole at the tail of the load grounding moving contact 8, it applies a force to the left to the load grounding moving contact 8, causing it to move to the left until the load grounding moving contact 8 is inserted into the load grounding stationary contact 17. When achieving conduction, the load grounding drive shaft 12 does not input torque, keeping the load grounding part in the open state. The drive shaft 13 inputs torque, causing the turntable 92 to rotate clockwise until the isolating moving contact 4 and the isolating stationary contact 16 make contact and conduct electricity. At this time, the circuit breaker grounding moving contact 5 and the isolating moving contact 4 move synchronously to ensure that they are in the open state, realizing the linkage of the isolating grounding function. In actual use and installation, functions such as double grounding, rapid grounding and circuit breaker grounding can be realized according to the usage requirements. At the same time, the load grounding crank arm box 18 and the circuit breaker grounding stationary contact 14 are detachable and can be freely combined and configured according to the usage conditions and requirements.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A double-grounding isolation switch, comprising a tank body, with an inlet socket and an outlet socket respectively provided at both ends of the tank body, and a load grounding moving contact and a circuit breaker grounding stationary contact respectively provided on the circumferential surface of the tank body, characterized in that, The load grounding moving contact and the circuit breaker grounding stationary contact are located on the same radial side of the tank body. Inside the tank, a moving contact seat is provided on the inlet seat, and an isolating stationary contact is provided on the outlet seat. An isolating moving contact is installed on the moving contact seat corresponding to the isolating stationary contact, and a circuit breaker grounding moving contact is installed on the moving contact seat corresponding to the circuit breaker grounding stationary contact. A turntable is provided on the moving contact seat, and a linkage rod that is rotatably connected to the isolating moving contact and the circuit breaker grounding moving contact are respectively connected to the turntable. The load grounding stationary contact and the load grounding moving contact are installed on the isolating stationary contact.

2. The isolating double-grounding switch according to claim 1, characterized in that, The moving contact seat is provided with a guide section, and the isolating moving contact and the circuit breaker grounding moving contact are slidably installed in the corresponding guide section. A spring contact finger is provided between the guide section and the isolating moving contact and the circuit breaker grounding stationary contact.

3. The isolating double-grounding switch according to claim 1 or 2, characterized in that, The inlet seat is provided with a flange face, and the inlet seat is connected to the tank body through a flange. The connection part between the tank body and the inlet seat has an opening for disassembling and assembling the moving contact seat.

4. The isolating double-grounding switch according to claim 1 or 2, characterized in that, The outlet socket is provided with a flange face, and the outlet socket is connected to the tank body through a flange. The connection part between the tank body and the outlet socket has an opening for isolating the disassembly and assembly of the stationary contact.

5. The isolating double-grounding switch according to claim 1 or 2, characterized in that, The circuit breaker grounding stationary contact is detachably installed on the tank body. One end of the circuit breaker grounding stationary contact is fixedly connected to a fixing block. The outer wall of the fixing block is provided with a flange surface for fixed connection with the tank body. The end of the fixing block away from the circuit breaker grounding stationary contact is fixedly connected to a conductive strip, which is fixedly connected to the tank body.

6. The isolating double-grounding switch according to claim 1 or 2, characterized in that, The load grounding moving contact is installed in the load grounding crank arm box, which is connected to the tank body via a flange. The load grounding crank arm box includes a crank arm that is anti-rotationally engaged with the load grounding drive shaft, and the end of the crank arm away from the load grounding drive shaft is connected to the load grounding moving contact.

7. The isolating double-grounding switch according to claim 6, characterized in that, The load grounding moving contact is provided with an elongated hole perpendicular to the direction of movement of the load moving contact at the connection position with the crank arm, which is used to balance the positional change caused by the conversion of the crank arm's rotational motion into linear motion.

8. The isolating double-grounding switch according to claim 1 or 2, characterized in that, The turntable has an anti-rotation connection with an insulated torsion bar for fixed connection with the drive shaft.

9. The isolating double-grounding switch according to claim 1 or 2, characterized in that, An isolation arc contact is provided at the end of the isolating stationary contact that is close to the isolating moving contact.

10. The isolating double-grounding switch according to claim 1 or 2, characterized in that, Molecular sieves are installed on the tank of the isolation double grounding switch.

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